Chemical reaction process for magnetite nanoparticle synthesis by atmospheric-pressure DC glow-discharge electrolysis

Yamazaki, Yuya; Shirai, Naoki; Nakagawa, Yusuke; Uchida, Satoshi; Tochikubo, Fumiyoshi

doi:10.7567/jjap.57.096203

Cited by 9 publications

(4 citation statements)

References 34 publications

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“…In general, dissolved oxygen (DO) affects chemical reactions in the solution. For example, Yamazaki and coworkers have reported that the DO concentration is a key parameter in the synthesis of magnetite nanoparticle by glow-discharge electrolysis [43]. The concentration of DO significantly determines the kind of the final product, nonmagnetic hematite (Fe 2 O 3 ) nanoparticles or ferromagnetic magnetite (Fe 3 O 4 ) nanoparticles.…”

Section: Effect Of Dissolved Oxygenmentioning

confidence: 99%

“…Consequently, the plasma-liquid interface as well as the bulk liquid becomes the reaction zone for many specific physical and chemical processes. Numerous researches report that this reaction zone can be used for synthesizing novel nanomaterials such as noble metals [33][34][35][36][37][38][39], magnetic materials [40][41][42][43], and alloys [44][45][46] in suitable conditions.…”

Section: Introductionmentioning

confidence: 99%

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Synthesis mechanism of cuprous oxide nanoparticles by atmospheric-pressure plasma electrolysis

Liu

Shirai

Sasaki

2020

J. Phys. D: Appl. Phys.

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The synthesis mechanism of cuprous oxide (Cu2O) nanoparticles by atmospheric-pressure plasma electrolysis was investigated experimentally. In the plasma electrolysis system, a helium plasma in contact with an NaCl electrolyte was used as the cathode, while a copper plate which was partly immersed into the electrolyte was used as the counter electrode. X-ray powder diffraction, field-emission scanning electron microscopy, and transmission electron microscopy were used for characterizing the synthesized products. The results indicate that the Cl− concentration and the pH value of the electrolyte dominate the synthesis of Cu2O nanoparticles. The reaction between CuCl 2 − produced via the anodic dissolution of Cu and OH− produced by plasma irradiation is responsible for the formation of Cu2O. The comparison between the plasma and conventional electrolysis has also been carried out, since the anodic dissolution of the Cu plate and the production of OH− are also available in the conventional electrolysis. As a result, we also observed the synthesis of Cu2O nanoparticles by the conventional electrolysis. However, we observed the differences between the plasma and conventional electrolysis in the synthesis rate, the minimum NaCl concentration, and the size and the shape of synthesized nanoparticles.

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Section: Effect Of Dissolved Oxygenmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Synthesis mechanism of cuprous oxide nanoparticles by atmospheric-pressure plasma electrolysis

Liu

Shirai

Sasaki

2020

J. Phys. D: Appl. Phys.

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“…In previous papers, we reported several types of atmospheric-pressure glow discharges using liquid electrolyte electrodes and helium flow [27][28][29][30][31][32][33][34][35][36][37]. We showed that the optical emission of Na was observed from the plasma when a NaCl solution worked as the cathode of the discharge [27][28][29][30][31].…”

Section: Introductionmentioning

confidence: 98%

Mechanism of droplet generation and optical emission of metal atoms in atmospheric-pressure dc glow discharge employing liquid cathode

Shirai

Suga

Sasaki

2020

Plasma Sources Sci. Technol.

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The mechanism of the droplet generation and the optical emission of metal atoms in an atmospheric-pressure dc glow discharge employing an electrolyte cathode were investigated experimentally. We examined the correlation among the dynamics of the electrolyte surface, the density and its spatial distribution of gas-phase droplets, and the optical emission intensity in an atmospheric-pressure dc glow discharge employing an electrolyte cathode. The experimental results reveal the following mechanism for the droplet generation and the optical emission of metal atoms. The correlation between the droplet density and the optical emission intensity indicates the importance of droplets in the transport of metal atoms from the electrolyte to the gas phase. The production of metal atoms from droplets seems to be a mechanism of the optical emission. We propose two mechanisms for the generation of droplets from the electrolyte cathode. The first is the distortion in the shape of the electrolyte surface. Droplets are produced from the tip of the cone-shaped electrolyte surface via a process similar to electrospray. The first mechanism works for the initiation of the droplet generation in the early stage in the temporal evolution of the discharge. The second mechanism is the explosive reaction between Na particulates and water. We speculate that Na particulates are produced from Na atoms in the gas phase. Once the second mechanism is switched on, the self-sustained productions Na atoms, Na particulates, and NaCl droplets are realized, resulting in the intense optical emission of metal atoms.

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“…The difference between the plasma-assisted and conventional electrolyses is summarized as follows; 1) the plasma-assisted electrolysis can utilize the interface between gas (plasma) and solution for redox reactions [2, 3], 2) electrons can have kinetic energy if the plasma works as the cathode [4-7], and 3) ions and neutral radicals are transported from the plasma in addition to electrons [8][9][10]. We can obtain various nanoparticles of metals [11][12][13][14] and oxides [15][16][17] in a form of suspension by plasma-assisted electrolysis. The synthesis of nanoparticles is owing to the reduction of metal cations by the reaction with electrons, but the contribution of atomic…”

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confidence: 99%

Observation of currentless redox reactions on surface of water jet immersed in low-pressure plasma

Ito¹,

Sakka²,

Sasaki³

2022

Plasma Sources Sci. Technol.

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We investigated oxidation-reduction reactions on the surface of water jet immersed in a low-pressure inductively coupled helium plasma. The electrical potential of the water jet was ﬂoating, and no electrical current was supplied from the plasma to the water jet. We observed the productions of molecular hydrogen and molecular oxygen. We also observed negligible consumption of water vapor in the gas phase, suggesting that the productions of hydrogen and oxygen were not owing to the conversion from water vapor. When we employed silver nitrate solution instead of pure water, we observed the decrease in the production rate of hydrogen, whereas the production rate of oxygen was the same in pure water and silver nitrate solution. In addition, we found the synthesis of silver particulates in the silver nitrate solution, indicating the competition between the reductions of H+ and Ag+. Thus, the experimental results reveal the simultaneous oxidation and reduction at the same plasma-liquid interface.

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Chemical reaction process for magnetite nanoparticle synthesis by atmospheric-pressure DC glow-discharge electrolysis

Cited by 9 publications

References 34 publications

Synthesis mechanism of cuprous oxide nanoparticles by atmospheric-pressure plasma electrolysis

Synthesis mechanism of cuprous oxide nanoparticles by atmospheric-pressure plasma electrolysis

Mechanism of droplet generation and optical emission of metal atoms in atmospheric-pressure dc glow discharge employing liquid cathode

Observation of currentless redox reactions on surface of water jet immersed in low-pressure plasma

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